- Have taken any of the following drugs within 30 days before study entry: amiodarone, astemizole, bepridil, buspirone, carbamazepine, cisapride, clarithromycin, cyclosporine, dihydroergotamine, ergotamine, erythromycin, flecainide, glucocorticoids, St. John's wort, itraconazole, ketoconazole, lovastatin, midazolam, nefazodone, phenobarbital, phenytoin, pimozide, pioglitazone, propafenone, propofol, quinidine, rifabutin, rifampin, rosiglitazone, simvastatin, tacrolimus, terfenadine, ticlopidine, or triazolam.